US4568598A
Expired / Lapsed
US
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Article with reduced friction polymer sheet support
Assignee: 3M Co
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Filing: 1984-10-30
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Granted: 1986-02-04
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Expires: 2004-10-30
Abstract
Abstract A reduced friction composite sheet construction comprises a semicrystalline polymeric sheet support having a first and second surface, said surfaces having in the range of 5 to 99 percent crystalline polymeric material and 1 to 95 percent amorphous polymeric material, said first surface having been subjected to sputter-etching which preferentially ablates said amorphous material compared to said crystalline material so as to provide on said first surface ridges or needles of amplitude in the range of 0.01 to 5.0 micrometers, and a separation at their apexes in the range of 0.01 to 1.0 micrometers and having an aspect ratio in the range of 0.5 to 7, said first surface having at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.7, and at least one functional layer coated on said second surface of said support.
Inventors
- 👤 Zayn Bilkadi
- 👤 William A. Hendrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/02; C23C14/021; C23C14/022; B; B05; B05D; B05D3/00; B05D3/04; B05D3/0433; B05D3/044; B05D3/0446; B29; B29C; B29C59/00; B29C59/14; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/84; G11B5/8404; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24471
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
147 words
A composite sheet-like article having a reduced friction backside comprising: a. a semicrystalline polymeric sheet support having a first and second surface, said surfaces having in the range of 5 to 99 percent crystalline polymeric material and 1 to 95 percent amorphous polymeric material, said first surface having been subjected to sputter etching which preferentially ablates said amorphous material compared to said crystalline material so as to provide on said first surface ridges, or needles of amplitude in the range of 0.01 to 5.0 micrometers, and a separation at their apexes in the range of 0.01 to 1.0 micrometers and having an aspect ratio in the range of 0.5 to 7, said first surface having at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.7, and b. at least one functional layer coated on said second surface of said support.
Claim 2
Dependent Claim
147 words
A composite sheet-like article having a reduced friction backside comprising: a. a semicrystalline polymeric sheet support having a first and second surface, said surfaces having in the range of 5 to 99 percent crystalline polymeric material and 1 to 95 percent amorphous polymeric material, said first surface having been subjected to sputter etching which preferentially ablates said amorphous material compared to said crystalline material so as to provide on said first surface ridges, or needles of amplitude in the range of 0.01 to 5.0 micrometers, and a separation at their apexes in the range of 0.01 to 1.0 micrometers and having an aspect ratio in the range of 0.5 to 7, said first surface having at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.7, and b. at least one functional layer coated on said second surface of said support.
Claim 3
Dependent Claim
24 words
The article according to claim 1 wherein said semicrystalline polymeric sheet support is polyester, polyolefin, polyamide, fluoropolymer, polyether, polyurethane, and blends or copolymers thereof.
Claim 4
Dependent Claim
22 words
The article according to claim 1 wherein said ridges or needles have an amplitude in the range of 0.01 to 2.0 micrometers.
Claim 5
Dependent Claim
25 words
The article according to claim 1 wherein said ridges or needles have a separation at their apexes in the range of 0.01 to 0.5 micrometer.
Claim 6
Dependent Claim
28 words
The article according to claim 1 wherein said first surface has at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.4.
Claim 7
Dependent Claim
28 words
The article according to claim 1 wherein said first surface has at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.3.
Claim 8
Dependent Claim
29 words
The article according to claim 1 wherein said functional layer is a photographic emulsion, magnetic layer, an adhesive layer, an abrasive layer, an anti-reflective layer, or an organic photoconductor.
Claim 9
Dependent Claim
18 words
The article according to claim 1 wherein said functional layer is a photographic emulsion or a magnetic layer.
Claim 10
Dependent Claim
14 words
The article according to claim 1 wherein said sheet is a magnetic recording tape.
Claim 11
Dependent Claim
15 words
The article according to claim 1 wherein said sheet is a pressure sensitive adhesive tape.
Claim 12
Dependent Claim
13 words
The article according to claim 1 wherein said sheet is a photographic film.
Claim 13
Dependent Claim
51 words
The article according to claim 1 wherein said sputter-etched surface as shown by XPS comprising four different types of surface carbon bonding designated C a , C i , C c , and C j , each type being present in the range of 0.2 to 75 percent of total carbon.
Claim 14
Dependent Claim
52 words
The article according to claim 12 wherein the four different types of surface carbon bonding designated C a , C i , C c , and C j are present in the range of 20 to 70 percent, 10 to 40 percent, 2 to 60 percent, and 3 to 25 percent, respectively.
Claim 15
Dependent Claim
49 words
The article according to claim 12 wherein the four different types of surface carbon bonding designated C a , C i , C c , and C j are present in the range of 40 to 70, 15 to 30, 5 to 20, and 4 to 20 percents, respectively.
Claim 16
Dependent Claim
12 words
A method for using the article of claim 1 for recording information.
Claim 17
Independent Claim
153 words
A method for making a reduced friction composite sheet-like article comprising the steps of: a. providing a semicrystalline polymeric sheet support having a first and second surface, said surfaces having in the range of 5 to 99 percent crystalline polymeric material and 1 to 95 percent amorphous polymeric material, b. subjecting said first surface to sputter etching so as to preferentially ablate said amorphous material compared to said crystalline material so as to provide on said first surface ridges or needles of amplitude in the range of 0.01 to 5.0 micrometers, and a separation at their apexes in the range of 0.01 to 1.0 micrometers and having an aspect ratio in the range of 0.5 to 7, said first surface having at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.7, and c. coating at least one functional layer on said second surface of said support.
Claim 18
Independent Claim
153 words
A method for making a reduced friction composite sheet-like article comprising the steps of: a. providing a semicrystalline polymeric sheet support having a first and second surface, said surfaces having in the range of 5 to 99 percent crystalline polymeric material and 1 to 95 percent amorphous polymeric material, b. subjecting said first surface to sputter etching so as to preferentially ablate said amorphous material compared to said crystalline material so as to provide on said first surface ridges or needles of amplitude in the range of 0.01 to 5.0 micrometers, and a separation at their apexes in the range of 0.01 to 1.0 micrometers and having an aspect ratio in the range of 0.5 to 7, said first surface having at least one of static and dynamic coefficients of friction in the range of 0.01 to 0.7, and c. coating at least one functional layer on said second surface of said support.
Claim 19
Dependent Claim
51 words
The method according to claim 16 wherein said sputter-etched surface as shown by XPS comprising four different types of surface carbon bonding designated C a , C i , C c , and C j , each type present being in the range of 0.2 to 75 percent of total carbon.
Claim 20
Dependent Claim
52 words
The method according to claim 16 wherein the four different types of surface carbon bonding designated C a , C i , C c , and C j are present in the range of 20 to 70 percent, 10 to 40 percent, 2 to 60 percent, and 3 to 25 percent, respectively.
Claim 21
Dependent Claim
49 words
The method according to claim 16 wherein the four different types of surface carbon bonding designated C a , C i , C c , and C j are present in the range of 40 to 70, 15 to 30, 5 to 20, and 4 to 20 percent, respectively.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |